J/A+A/513/A55 Effective collision strengths of Ni II (Cassidy+, 2010)
Electron-impact excitation of Ni II.
Collision strengths and effective collision strengths for low-lying
fine-structure forbidden transitions.
Cassidy C.M., Ramsbottom, C.A., Scott M.P., Burke, P.G.
<Astron. Astrophys. 513, A55 (2010)>
=2010A&A...513A..55C 2010A&A...513A..55C
ADC_Keywords: Atomic physics
Keywords: atomic data - atomic processes - scattering - plasmas -
methods: numerical - binaries: symbiotic
Abstract:
Considerable demand exists for electron excitation data for Ni II,
since lines from this abundant ion are observed in a wide variety of
laboratory and astrophysical spectra. The accurate theoretical
determination of these data can present a significant challenge
however, due to complications arising from the presence of an open
3d-shell in the description of the target ion.
Description:
Table 2 presents effective collision strengths for the 153 forbidden
fine-structure transitions between the energetically lowest 18 levels
of Ni II. The 27 temperatures considered are listed at the top of the
table in three rows each consisting of 10 columns. The effective
collision strengths are subsequently listed - the first column labels
the transition and the remaining columns list the effective collision
strength for each temperature. The index values for each level have
been assigned in Table 1 to denote the particular transition. The
CS.tar file contains the collision strength data for each of the 153
transitions. These are stored in individual files each composed of two
columns. The first column corresponds to the incident electron energy
in Rydbergs and the second corresponds to the associated collision
strength. The files are labelled by transition using the same indexing
assigned in Table 1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 36 18 Lowest 18 fine-structure levels associated with
the collision data
table2.dat 221 153 Effective collision strengths for low-lying
forbidden transitions in Ni II
csdata/* . 153 *Collision strength data for each of the 153
transitions
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Note on csdata/* : Files labelled file00II.00JJ where II is the i level of
transition and JJ is the j level of transition.
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Term Term
18- 20 F3.1 --- J J value
26- 30 I5 cm-1 Enist Observed energy value from NIST databank (1)
35- 36 I02 --- Index Index
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Note (1): NIST: http://www.nist.gov/physlab/data/asd.cfm
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I02 --- i [1,17] i level of transition
3 A1 --- --- [-]
4- 5 I02 --- j [2,18] j level of transition
7- 13 E7.3 --- ECS(30) Effective collision strength at Te=30K
15- 21 E7.3 --- ECS(100) Effective collision strength at Te=100K
23- 29 E7.3 --- ECS(300) Effective collision strength at Te=300K
31- 37 E7.3 --- ECS(500) Effective collision strength at Te=500K
39- 45 E7.3 --- ECS(750) Effective collision strength at Te=750K
47- 53 E7.3 --- ECS(1000) Effective collision strength at Te=1000K
55- 61 E7.3 --- ECS(1300) Effective collision strength at Te=1300K
63- 69 E7.3 --- ECS(1500) Effective collision strength at Te=1500K
71- 77 E7.3 --- ECS(1800) Effective collision strength at Te=1800K
79- 85 E7.3 --- ECS(2000) Effective collision strength at Te=2000K
87- 93 E7.3 --- ECS(2300) Effective collision strength at Te=2300K
95-101 E7.3 --- ECS(2500) Effective collision strength at Te=2500K
103-109 E7.3 --- ECS(5000) Effective collision strength at Te=5000K
111-117 E7.3 --- ECS(7500) Effective collision strength at Te=7500K
119-125 E7.3 --- ECS(10k) Effective collision strength at Te=10000K
127-133 E7.3 --- ECS(13k) Effective collision strength at Te=13000K
135-141 E7.3 --- ECS(15k) Effective collision strength at Te=15000K
143-149 E7.3 --- ECS(18k) Effective collision strength at Te=18000K
151-157 E7.3 --- ECS(20k) Effective collision strength at Te=20000K
159-165 E7.3 --- ECS(30k) Effective collision strength at Te=30000K
167-173 E7.3 --- ECS(40k) Effective collision strength at Te=40000K
175-181 E7.3 --- ECS(50k) Effective collision strength at Te=50000K
183-189 E7.3 --- ECS(60k) Effective collision strength at Te=60000K
191-197 E7.3 --- ECS(70k) Effective collision strength at Te=70000K
199-205 E7.3 --- ECS(80k) Effective collision strength at Te=80000K
207-213 E7.3 --- ECS(90k) Effective collision strength at Te=90000K
215-221 E7.3 --- ECS(100k) Effective collision strength at Te=100000K
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Byte-by-byte Description of file: csdata/*
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Bytes Format Units Label Explanations
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4- 15 E12.8 Ry IEE Incident electron energy
19- 30 E12.8 --- CS Associated collision strength
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Acknowledgements:
Clara Cassidy, ccassidy15(at)qub.ac.uk,
Queen's University of Belfast, Northern Ireland
(End) Clara Cassidy [Queen's Univ. Belfast], Patricia Vannier [CDS] 30-Apr-2010